Seasonal variability of intertidal bacterial metabolism and growth efficiency in an exposed sandy beach during low tide |
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Authors: | Cédric Hubas Dominique Lamy Luis Felipe Artigas Dominique Davoult |
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Institution: | 1.FRE 2816,Université du Littoral C?te d’Opale, Maison de la Recherche en Environnement Naturel,Dunkerque Cedex,France;2.UMR 7144 AD2M,Université Pierre et Marie Curie-Paris6, Station Biologique de Roscoff,Roscoff,France |
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Abstract: | Benthic gross primary production (GPP) and community respiration (BCR) were regularly measured on sandy beach sediment during
low tide in a megatidal ecosystem. These measurements were assessed during 2 years in situ within a benthic chamber simultaneously
with bacterial production (BP). Results suggested that community respiration in Wimereux sandy beach sediments was probably
dominated by bacterial respiration and that the estimated benthic bacterial growth efficiency (BGE) was highly variable. Although
temperature significantly controlled both BP and BCR during low tide at the annual scale, the temperature effect on BGE was
not significant. The instability and sediment erosion caused by the wave action and the tidal cycle were thus thought to influence
the BGE. Since the sampling site is regularly affected by Phaeocystis foam deposit (enhancing the BCR and decreasing the BGE), and since GPP rates were highly variable and supported by high assimilation
numbers (i.e., >1 mgC mgChla
−1 h−1), phytoplankton organic matter deposit following the immersion of the study site was thought to explain the BGE variability. |
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